Oktay Aktogan focused on backend development and DevOps for the LibreSign/libresign repository, addressing a critical reliability issue in PDF signature verification. He implemented a targeted patch that normalized timezones to UTC for the pdfsig and pdfinfo utilities, ensuring consistent verification results regardless of system timezone differences. This PHP-based solution reduced cross-region discrepancies and minimized support incidents related to signature validation. By introducing this low-risk change without altering the API, Oktay improved deployment stability and user trust. His work demonstrated a thoughtful approach to system interoperability, leveraging his expertise in backend development and DevOps to enhance the reliability of PDF workflows.